Based on the thermodynamic parameters and various experimental diffusion data available in the literature, the atomic mobilities of Ti and Nb in body-centered cubic Ti–Nb alloys were critically evaluated with respect to temperatures and compositions in terms of the CALPHAD method. The finally obtained mobility parameters were presented, and extensive comparisons between the calculated and experimentally measured quantities were made. The results show that the obtained mobility parameters could satisfactorily reproduce most of the experimental results, and therefore they could be safely used in diffusion-related simulations to deal with practical problems of interest. In addition, the obtained mobilities, together with the published thermodynamic information, were successfully applied to model the movement of Kirkendall markers in the Ti/Nb diffusion couples.

Kinetic Modeling of Diffusion Mobilities in BCC Ti–Nb Alloys. Y.Liu, T.Pan, L.Zhang, D.Yu, Y.Ge: Journal of Alloys and Compounds, 2009, 476[1-2], 429-35